PREPARATION AND REACTIVITY OF METAL-CONTAINING MONOMERS .38. INVESTIGATION OF [CR3O(OCOCH=CH2)(6)]OH CLUSTER MONOMER AND ITS POLYMER BY MEANS OF IR, XP, AND MASS-SPECTROSCOPY

The monomer [Cr3O(OCOCH=CH2)(6)]OH was produced by reaction of acrylic acid with fresh chromium hydroxide. This monomer was investigated by a number of physicochemical methods. It was found that acrylate residu es are bonded to the metal atoms via the carboxy group so that the dou ble bond is not involved in coordination. A comparative study of the d issociative fragmentation of the [M(3)OAcr(6)](+) clusters, where M is Cr or Fe and Acr is OCOCH=CH2, shows that in the case of Fe the [M(3) OAcr(3)](+) fragment is the main product of decomposition of [M(3)OACr (3)](+) cluster cation, whereas this was not observed in the case of C r. The [M(2)OAcr(4)](+) fragments are characteristic of decomposition products of the Cr complex and do not form in the case of Fe. The radi cal polymerization of Cr-containing monomers results in monodentate co ordination of the carboxy groups, which does not appear in the initial monomer.